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Questions and Answers
What is the main difference between contact and non-contact forces?
Which of the following is an example of a non-contact force?
What kind of force fills a parachute with air to make it land more slowly?
If an object moves across a surface, which force is responsible for the effort needed to move it?
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What does tension force involve when an object like a string, rope, wire, or cable is stretched?
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Which force attracts objects 'downward' to the ground and is experienced by everything on Earth?
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Rollers are attached to the object that they are moving.
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Rollers and wheels are the same because they both have an axle that holds them in place.
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Rollers reduce resistance caused by friction, making it easier to move objects.
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Ancient Egyptians used rollers to build the Great Pyramids faster than expected due to the machinery available during that time.
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Rollers are still used today in some warehouses, stores, and bottle depots.
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A rolling pin is an example of a roller used to help in baking.
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